diff --git a/components/pm-subscription-handler/tox.ini b/components/pm-subscription-handler/tox.ini
index fcbb647..523338d 100644
--- a/components/pm-subscription-handler/tox.ini
+++ b/components/pm-subscription-handler/tox.ini
@@ -26,6 +26,7 @@
     pytest
     coverage
     pytest-cov
+    responses==0.10.7
 setenv =
     PYTHONPATH={toxinidir}/pmsh_service:{toxinidir}/pmsh_service/mod:{toxinidir}/tests
 commands=
@@ -39,3 +40,4 @@
 
 [flake8]
 max-line-length=100
+ignore = E999